<?php
/**
 * TResultProperty class file.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2008 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id: TResultProperty.php 2624 2009-03-19 21:20:47Z godzilla80@gmx.net $
 * @package System.Data.SqlMap.Configuration
 */

/**
 * TResultProperty corresponds a <property> tags inside a <resultMap> tag.
 *
 * The {@link NullValue setNullValue()} attribute can be set to any valid
 * value (based on property type). The {@link NullValue setNullValue()} attribute
 * is used to specify an outgoing null value replacement. What this means is
 * that when a null value is detected in the result, the corresponding value of
 * the {@link NullValue getNullValue()} will be used instead.
 *
 * The {@link Select setSelect()} property is used to describe a relationship
 * between objects and to automatically load complex (i.e. user defined)
 * property types. The value of the {@link Select setSelect()} property must be
 * the name of another mapped statement. The value of the database
 * {@link Column setColumn()} that is defined in the same property element as
 * this statement attribute will be passed to the related mapped statement as
 * the parameter. The {@link LazyLoad setLayLoad()} attribute can be specified
 * with the {@link Select setSelect()} .
 *
 * @author Wei Zhuo <weizho[at]gmail[dot]com>
 * @version $Id: TResultProperty.php 2624 2009-03-19 21:20:47Z godzilla80@gmx.net $
 * @package System.Data.SqlMap.Configuration
 * @since 3.1
 */
class TResultProperty extends TComponent
{
	private $_nullValue;
	private $_propertyName;
	private $_columnName;
	private $_columnIndex=-1;
	private $_nestedResultMapName;
	private $_nestedResultMap;
	private $_valueType;
	private $_typeHandler;
	private $_isLazyLoad=false;
	private $_select;

	private $_hostResultMapID='inplicit internal mapping';

	const LIST_TYPE = 0;
	const ARRAY_TYPE = 1;

	/**
	 * Gets the containing result map ID.
	 * @param TResultMap containing result map.
	 */
	public function __construct($resultMap=null)
	{
		if($resultMap instanceof TResultMap)
			$this->_hostResultMapID = $resultMap->getID();
	}

	/**
	 * @return mixed null value replacement.
	 */
	public function getNullValue()
	{
		return $this->_nullValue;
	}

	/**
	 * @param mixed null value replacement.
	 */
	public function setNullValue($value)
	{
		$this->_nullValue = $value;
	}

	/**
	 * @return string name of a property of the result object that will be set to.
	 */
	public function getProperty()
	{
		return $this->_propertyName;
	}

	/**
	 * @param string name of a property of the result object that will be set to.
	 */
	public function setProperty($value)
	{
		$this->_propertyName = $value;
	}

	/**
	 * @return string name of the column in the result set from which the value
	 * will be used to populate the property.
	 */
	public function getColumn()
	{
		return $this->_columnName;
	}

	/**
	 * @param string name of the column in the result set from which the value
	 * will be used to populate the property.
	 */
	public function setColumn($value)
	{
		$this->_columnName = $value;
	}

	/**
	 * @return int index of the column in the ResultSet from which the value will
	 * be used to populate the object property
	 */
	public function getColumnIndex()
	{
		return $this->_columnIndex;
	}

	/**
	 * @param int index of the column in the ResultSet from which the value will
	 * be used to populate the object property
	 */
	public function setColumnIndex($value)
	{
		$this->_columnIndex = TPropertyValue::ensureInteger($value);
	}

	/**
	 * @return string ID of another <resultMap> used to fill the property.
	 */
	public function getResultMapping()
	{
		return $this->_nestedResultMapName;
	}

	/**
	 * @parma string ID of another <resultMap> used to fill the property.
	 */
	public function setResultMapping($value)
	{
		$this->_nestedResultMapName = $value;
	}

	/**
	 * @return TResultMap nested result map.
	 */
	public function getNestedResultMap()
	{
		return $this->_nestedResultMap;
	}

	/**
	 * @param TResult nested result map.
	 */
	public function setNestedResultMap($value)
	{
		$this->_nestedResultMap = $value;
	}

	/**
	 * @return string property type of the object property to be set.
	 */
	public function getType()
	{
		return $this->_valueType;
	}

	/**
	 * @param string property type of the object property to be set.
	 */
	public function setType($value)
	{
		$this->_valueType = $value;
	}

	/**
	 * @return string custom type handler class name (may use namespace).
	 */
	public function getTypeHandler()
	{
		return $this->_typeHandler;
	}

	/**
	 * @param string custom type handler class name (may use namespace).
	 */
	public function setTypeHandler($value)
	{
		$this->_typeHandler = $value;
	}

	/**
	 * @return string name of another mapped statement
	 */
	public function getSelect()
	{
		return $this->_select;
	}

	/**
	 * The select property is used to describe a relationship between objects
	 * and to automatically load complex (i.e. user defined) property types.
	 * @param string name of another mapped statement.
	 */
	public function setSelect($value)
	{
		$this->_select = $value;
	}

	/**
	 * @return boolean indicate whether or not the select statement's results should be lazy loaded
	 */
	public function getLazyLoad()
	{
		return $this->_isLazyLoad;
	}

	/**
	 * @param boolean indicate whether or not the select statement's results should be lazy loaded
	 */
	public function setLazyLoad($value)
	{
		$this->_isLazyLoad = TPropertyValue::ensureBoolean($value,false);
	}

	/**
	 * Gets the value for the current property, converts to applicable type if necessary.
	 * @param TSqlMapTypeHandlerRegistry type handler registry
	 * @param array result row
	 * @return mixed property value.
	 */
	public function getPropertyValue($registry,$row)
	{
		$value = null;
		$index = $this->getColumnIndex();
		$name = $this->getColumn();
		if($index > 0 && isset($row[$index]))
			$value = $this->getTypedValue($registry,$row[$index]);
		else if(isset($row[$name]))
			$value = $this->getTypedValue($registry,$row[$name]);
		if(($value===null) && ($this->getNullValue()!==null))
			$value = $this->getTypedValue($registry,$this->getNullValue());
		return $value;
	}

	/**
	 * @param TSqlMapTypeHandlerRegistry type handler registry
	 * @param mixed raw property value
	 * @return mixed property value casted to specific type.
	 */
	protected function getTypedValue($registry,$value)
	{
		if(($handler = $this->createTypeHandler($registry))!==null)
			return $handler->getResult($value);
		else
			return $registry->convertToType($this->getType(), $value);
	}

	/**
	 * Create type handler from {@link Type setType()} or {@link TypeHandler setTypeHandler}.
	 * @param TSqlMapTypeHandlerRegistry type handler registry
	 * @return TSqlMapTypeHandler type handler.
	 */
	protected function createTypeHandler($registry)
	{
		$type=$this->getTypeHandler() ? $this->getTypeHandler() : $this->getType();
		$handler=$registry->getTypeHandler($type);
		if($handler===null && $this->getTypeHandler())
			$handler = Prado::createComponent($type);
		return $handler;
	}

	/**
	 * Determines if the type is an instance of ArrayAccess, TList or an array.
	 * @return int TResultProperty::LIST_TYPE or TResultProperty::ARRAY_TYPE
	 */
	protected function getPropertyValueType()
	{
		if(class_exists($type = $this->getType(), false)) //NO force autoloading
		{
			if($type==='TList')
				return self::LIST_TYPE;
			$class = new ReflectionClass($type);
			if($class->isSubclassOf('TList'))
				return self::LIST_TYPE;
			if($class->implementsInterface('ArrayAccess'))
				return self::ARRAY_TYPE;
		}
		if(strtolower($type) == 'array')
			return self::ARRAY_TYPE;
	}

	/**
	 * Returns true if the result property {@link Type getType()} is of TList type
	 * or that the actual result object is an instance of TList.
	 * @param object result object
	 * @return boolean true if the result object is an instance of TList
	 */
	public function instanceOfListType($target)
	{
		if($this->getType()===null)
			return  TPropertyAccess::get($target,$this->getProperty()) instanceof TList;
		return $this->getPropertyValueType() == self::LIST_TYPE;
	}

	/**
	 * Returns true if the result property {@link Type getType()} is of ArrayAccess
	 * or that the actual result object is an array or implements ArrayAccess
	 * @param object result object
	 * @return boolean true if the result object is an instance of ArrayAccess or is an array.
	 */
	public function instanceOfArrayType($target)
	{
		if($this->getType()===null)
		{
			$prop = TPropertyAccess::get($target,$this->getProperty());
			if(is_object($prop))
				return $prop instanceof ArrayAccess;
			return is_array($prop);
		}
		return $this->getPropertyValueType() == self::ARRAY_TYPE;
	}
}

